Key events involving Yahoo and its performance - Article Photos 9/10

FILE - In this Oct. 1, 2012 file photo, Tumblr founder David Karp participates in the "Bloomberg Leadership Summit" seminar in New York. In a deal announced Monday, May 20, 2013, Yahoo is buying New York-based Tumblr, the online blogging forum, for $1.1 billion. About $275 million will go to Karp, 26, who dropped out of high school to concentrate on computer programming and started Tumblr six years ago. (AP Photo/Charles Sykes/Invision for Advertising Week)